OBD Guide
ENFRDEESPT

P1668

Fuel Injector 3 Mechanical Fault

P1668 is an OBD-II diagnostic trouble code meaning: Fuel Injector 3 Mechanical Fault. Common causes: nozzle clogged, mechanical damage to the injector. Estimated repair cost: $17–50.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$17–50 (est.)

Symptoms

  • Rough engine operation
  • Power Loss
  • Increased fuel consumption
  • Misfire in cylinder 3
  • Check Engine Light Is On

Causes

  • Nozzle clogged
  • Mechanical damage to the injector
  • Wear of injector components
  • Problems with wiring to the injector
  • Low fuel pressure

How to Fix

  1. Check the condition of the cylinder 3 injector
  2. Clean or replace the injector
  3. Check the integrity of the wiring harness
  4. Diagnose the fuel system
  5. Check the pressure in the fuel rail

Related codes

P1669P1667P0171

Error P1668 by Vehicle Brand

FordLincolnMercury

FAQ

What does the P1668 code mean?

P1668 is an OBD-II diagnostic trouble code that indicates: Fuel Injector 3 Mechanical Fault

What causes a P1668 error code?

The most common causes of P1668 include: Nozzle clogged; Mechanical damage to the injector; Wear of injector components; Problems with wiring to the injector.

How do I fix a P1668 diagnostic trouble code?

To fix P1668: Check the condition of the cylinder 3 injector. Clean or replace the injector. Check the integrity of the wiring harness. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1668?

Limited driving only, diagnose soon

How much does it cost to fix P1668?

The estimated repair cost for P1668 is $17–50. Actual cost depends on your vehicle, location, and labor rates.

FRDEESPT

See also: Russian version · NationStat